A traffic light and signal pole is subjected to the weight of each traffic signal W S = 240 N and the weight of the road lamp W L = 250 N. The pole is fixed at the base. Find the principal normal...

A traffic light and signal pole is subjected to the weight of each traffic signal W_S
= 240 N and the weight of the road lamp W_L
= 250 N. The pole is fixed at the base. Find the principal normal stresses and the maximum shear stress on element B located 5.8 m above the base (see figure). Assume that the weight of the pole and lateral arms is included in the signal and lamp weights.